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42 lines
4.7 KiB
Markdown
42 lines
4.7 KiB
Markdown
# Agent Note: 注入内容逐字投影,去除 XML 封套
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Status: implemented
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[English](2026-07-20-unwrap-injected-content-envelopes.md) | 中文
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## 问题
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两类注入的会话内容在渲染进模型 transcript(文本记录)时被包在 XML 封套里:`steering/message` 包成 `<steering source="…">…</steering>`,`context/message` 包成 `<context source="…">…</context>`(后者有一个 `'raw'` 退出选项可跳过封套)。这些封套意在告诉模型「这是注入内容,不是用户在说话」。
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两个问题:
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- **没有模型在这些标签上训练过。** `<steering>` 和 `<context>` 是任何模型都未被教会去读的任意标记,因此这层框架只是徒增 token 而没有可靠效果,还可能起反作用——已录制的 transcript 显示,模型会把 `<steering>` 指令当成第三方元数据而拒绝服从,只回答原始提示词。
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- **会话表层是承载框架的错误层次。** 表层的职责是把持久日志投影为模型 transcript;决定内容如何措辞并不是它的事。想要特定框架的调用方可以在注入前自行格式化内容——唯一的重度生产方(`workspace-context`)本就这样做,它自带完整的 `<system-reminder>` 框架,并用 `envelope: 'raw'` 退出 `<context>` 封套。剩下的标签机制(`ContextEnvelope` 类型,以及贯穿 `InjectOptions`、`HookContext`、`context/message` 事件和 agent loop(智能体循环)的 `envelope` 字段)所服务的区分,本应归属调用方。
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## 决策
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注入的会话内容逐字投影,框架由调用方自行负责。`deriveEventMessage` 把 `user/message` 的内容块原样送达模型;`source` 保留在持久事件日志中,但不渲染。
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`ContextEnvelope` 类型和所有 `envelope` 字段都被移除——包括 `SessionEventMap` 中的 `context/message`、`InjectOptions`、`HookContext`,以及 `dsh-agent-loop` 中 `inject()`/`additionalContexts` 的相关管线。`workspace-context` 不再请求 `'raw'`;它自带框架的内容渲染方式不变。`renderTagged`/`renderContextEnvelope` 辅助函数被删除。`context/message.meta` 仍携带持久的、对模型隐藏的 JSON 状态。
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封套曾携带的 `source` 来源信息并未丢失——它仍保留在持久事件上;只是不再渲染进 transcript。
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## 权衡的替代方案
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- **保留 `<context>` 封套,只对 steering(中途引导)去封套** —— 会为一个没有模型会读的框架位保留 `ContextEnvelope`/`envelope` 机制,并保留主要生产方本就退出的那种不一致。
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- **仅对插件来源的内容保留 envelope 字段** —— 会按 `source.kind` 把一条投影拆成两条,却没有观察到任何收益;插件引导 agent 时(钩子桥接器的轮次续行原因)同样希望指令被遵从,而不是被贴标签。
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- **把去封套的逻辑移入适配器** —— 规范投影就是模型可见契约(「模型可见 ⟺ 已记录」);让各适配器在框架上各行其是,会使派生的 transcript 依赖于适配器。调用方确实想要的框架应放进调用方自己的内容里,而不是适配器。
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## 结果
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- 中途引导与注入的上下文以与普通用户提示词相同的权重到达模型。
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- transcript 不再区分注入内容与用户消息;需要这一区分的消费方读取持久事件日志,其中事件类型、`source` 和 `meta` 完整保留。
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- `hook-{cc,codex}-stop-continue` ACP(Agent Client Protocol)快照已重新录制:旧录制捕获的是模型把 steering 当作第三方元数据而拒绝服从,正是本次修复针对的失败模式。
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- [内容块词汇表 Agent Note](../architecture/2026-06-11-content-block-vocabulary.md) 中关于带标签封套的条款已修订为指向本文。
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## 推迟事项
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`workspace-context` 已经自行为内容加框架:它把一个完整的 `<system-reminder>…</system-reminder>` 块作为消息内容发出,而不依赖表层封套。这种调用方自有的模式才是应保留的——表层逐字透传内容,任何框架都住在生产方自己的内容里。
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曾经存在两条框架路径——调用方自行加框架(`workspace-context` 的 `<system-reminder>`),以及表层封套(`deriveEventMessage` 加上的 `<context>`/`<steering>`)。本次变更移除了后者,只留下调用方自有的框架。如果未来又需要带标签的框架,应由事件的 `meta` map(生产方附加、对模型隐藏的元数据字段)来统一它,交给专门的渲染器或适配器消费,而不是在 `deriveEventMessage` 中重新硬编码标签。生产方在 `meta` 中声明所需的框架,由一个渲染器统一施加;会话表层的投影始终保持逐字透传。
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